Yo, I just read a review that these folks did where they put a just released clutch sheave in a Grizzly 700. According to their review, it added low-end power, mid-range power and top-end speed.

The review they did was over here: http://atvtorture.com. There forum has a thread about 4 pages long in regards to the clutch sheave they put on.

Does anyone else have any experience with one of these?

Thanks!  

the grizzly is a shaft drive, with the ultramatic clutch.

i have heard of the clutch sheave and heard good things, though i haven't installed one yet.

just be aware that this will most likely void your warranty.